1. rails g task db droptables
2. in lib/tasks/db.rake file
namespace :db do desc "drop some seed tables" task droptables: :environment do Table1.destroy_all Table2.destroy_all Table3.destroy_all ... end end
namespace :db do desc "drop some seed tables" task droptables: :environment do Table1.destroy_all Table2.destroy_all Table3.destroy_all ... end end